In this post, we will examine PAP and CHAP forms of PPP authentication. The emphasis here will be on the fact that these technologies are one-way in nature. So many of my CCIE-level students believe that they must be configured in a bidirectional configuration. I guess this is because it is what traditional Cisco classes always demonstrate at the CCNA and CCNP levels. OK - I have pre-configured two routers, R1 and R2, they are connected by their Serial 0/0 interfaces. Let us begin with R1 as a... Read More
If you ever used IPCP for address allocation with PPP ("ip address negotiated" on client side and "peer default ip address" on server side) you may have noticed that the mask assigned to a client is always /32. It does not matter what mask a server uses on it's side of the connection, just PPP is designed to operate this way. Read More

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